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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07adb23efc6ef14812182e62f6c3b9204c1c73b2a99f58fbb3609cc11d174864' 
  AND token = '/1agu78Kjj0e/7MKf8LMtS9OY7bD8UPnAAqUPabMTCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}